A typical On-Board Charger (OBC) consists of several key stages, including AC-DC rectification, Power Factor Correction (PFC), and DC-DC conversion. High efficiency, high power density, and reliability are the core objectives of OBC design. In the PFC stage, Boost or Totem-Pole topologies are commonly used, while LLC resonant or phase-shifted full-bridge topologies are commonly used in the DC-DC stage.

VAST SEMI offers a wide range of high-performance power devices for OBCs:

PFC Stage:

VAST MOS T-Series or SiC MOSFETs: These devices are ideal due to their low on-resistance and fast switching characteristics, which can significantly improve efficiency.

DC-DC Stage:

Main Switching: The ultra-fast switching speed of the VAST MOS S series is well-suited for high-frequency LLC applications.

Synchronous Rectifier: The low on-resistance characteristics of the VAST MOS T series can further optimize efficiency.

Auxiliary Power Supplies:

VAST MOS A Series: Offers a good balance of performance and cost.

High Power OBC Applications:

VAST SEMI's IGBT Products: These are an excellent choice, especially under high voltage and high current conditions.

The application of these advanced power devices not only increases the efficiency of OBCs but also supports higher power density designs by reducing switching losses and improving thermal performance.